org.apache.parquet.column.values.plain

Class PlainValuesReader

java.lang.Object

org.apache.parquet.column.values.ValuesReader

org.apache.parquet.column.values.plain.PlainValuesReader

Direct Known Subclasses:

PlainValuesReader.DoublePlainValuesReader, PlainValuesReader.FloatPlainValuesReader, PlainValuesReader.IntegerPlainValuesReader, PlainValuesReader.LongPlainValuesReader

public abstract class PlainValuesReader
extends ValuesReader

Plain encoding for float, double, int, long

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PlainValuesReader.DoublePlainValuesReader
static class	PlainValuesReader.FloatPlainValuesReader
static class	PlainValuesReader.IntegerPlainValuesReader
static class	PlainValuesReader.LongPlainValuesReader

Field Summary

Fields

Modifier and Type	Field and Description
protected LittleEndianDataInputStream	in

Constructor Summary

Constructors

Constructor and Description
PlainValuesReader()

Method Summary

Modifier and Type	Method and Description
void	initFromPage(int valueCount, ByteBufferInputStream stream) Called to initialize the column reader from a part of a page.

Methods inherited from class org.apache.parquet.column.values.ValuesReader

readBoolean, readBytes, readDouble, readFloat, readInteger, readLong, readValueDictionaryId, skip

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

in

protected LittleEndianDataInputStream in

Constructor Detail

PlainValuesReader

public PlainValuesReader()

Method Detail

initFromPage

public void initFromPage(int valueCount,
                         ByteBufferInputStream stream)
                  throws IOException

Description copied from class: ValuesReader

Called to initialize the column reader from a part of a page. Implementations must consume all bytes from the input stream, leaving the stream ready to read the next section of data. The underlying implementation knows how much data to read, so a length is not provided. Each page may contain several sections:

• repetition levels column
• definition levels column
• data column

Specified by:

initFromPage in class ValuesReader

Parameters:

valueCount - count of values in this page

stream - an input stream containing the page data at the correct offset

Throws:

IOException - if there is an exception while reading from the input stream